General:
* Combination - implies merging or uniting separate elements.
* Unification - emphasizes bringing together different parts into a whole.
* Amalgamation - suggests a complete blending of distinct parts.
* Synthesis - implies creating something new and unified from separate parts.
* Incorporation - emphasizes including something into an existing whole.
* Interconnection - focuses on the relationship between parts within a whole.
* Cohesion - emphasizes the bond or connection between different parts.
Specific contexts:
* In technology: Interoperability
* In society: Inclusion
* In math: Summation
* In business: Merger
To find the most accurate synonym, consider the specific meaning of "integration" in your context and choose the word that best conveys that meaning.